________ is an agent used to kill germs

To protect against obstructed or kinked tubing, simple bubble humidifiers incorporate which of the following?

a. HEPA outlet filter b. Pressure relief valve c. Automatic hygrometer d. Electronic alarm system

________ is a field that helps treat disorders of the central nervous system including chronic pain.

A) Natural modulation B) Neuromodulation C) Neuropain D) None of the above